import React from 'react';
import ReactDOM from 'react-dom';

function Blog(props) {
    let sidebar =
            <ul>
                {props.posts.map((post) =>
                    <li key={post.id}>
                        {post.title}
                    </li>)}
            </ul>
        ;
    const content = props.posts.map((post) =>
        <div key={post.id}>
            <h3>{post.title}</h3>
            <p>{post.content}</p>
        </div>
    );
    return (
        <div>
            {sidebar}
            <hr />
            {content}
        </div>
    );
}

const posts = [
    {id: 1, title: 'Hello World', content: 'Welcome to learning React!'},
    {id: 2, title: 'Installation', content: 'You can install React from npm.'}
];
ReactDOM.render(
    <Blog posts={posts}/>,
    document.getElementById('example')
);